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icount: fix deadlock when all cpus are sleeping 

When all cpus are sleeping (e.g in WFI), to avoid a deadlock
in the main_loop, wake it up in order to start the warp timer.

Signed-off-by: Clement Deschamps <clement.deschamps@greensocs.com>
Message-Id: <20181021142103.19014-1-clement.deschamps@greensocs.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
master
Clement Deschamps 2018-10-21 16:21:03 +02:00 committed by Paolo Bonzini
parent fc3d1bad1e
commit 013aabdc66
1 changed files with 8 additions and 0 deletions
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8
cpus.c
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@ -1554,6 +1554,14 @@ static void *qemu_tcg_rr_cpu_thread_fn(void *arg)
atomic_mb_set(&cpu->exit_request, 0);
}
if (use_icount && all_cpu_threads_idle()) {
/*
* When all cpus are sleeping (e.g in WFI), to avoid a deadlock
* in the main_loop, wake it up in order to start the warp timer.
*/
qemu_notify_event();
}
qemu_tcg_rr_wait_io_event(cpu ? cpu : first_cpu);
deal_with_unplugged_cpus();
}